ABSTRACT
Man's response to situations in the day's work is the measure of his efficiency. When the response results in behavior which satisfies the immediate, pressing demands and, adapts itself to change, growth, and progress, efficiency is perfect. An uneventful environment means mental stagnation. With nothing to compel selective action comes dulness, then in time retrogression. Progress, improvement, requires resistance—something to work against. The human pictures represent men's physiological and mental reorganization in a changed environment. They are wholly comparable to the adaptations of lower animals. The history of animals from the lowest to man reveals continuous, though more or less interrupted, changes, resulting from the attempt to maintain harmonious relations between the organism and its environment. The mental effect of deterioration of the tissues of the bodily organs is evident. Development implies a reconstruction— mental and physical—leading to the restoration of a lost equilibrium between an organism and its environment.
